Since there is no system fimware for grub-emu, the TPM2_PCR_Event
command becomes the only choice to implement grub_tcg2_cap_pcr().
Signed-off-by: Gary Lin <g...@suse.com>
---
grub-core/lib/tss2/tcg2_emu.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/grub-core/lib/tss2/tcg2_emu.c b/grub-core/lib/tss2/tcg2_emu.c
index cab930d2b..f461515de 100644
--- a/grub-core/lib/tss2/tcg2_emu.c
+++ b/grub-core/lib/tss2/tcg2_emu.c
@@ -22,6 +22,7 @@
#include <tss2_buffer.h>
#include <tss2_structs.h>
+#include <tpm2_cmd.h>
#include <tcg2.h>
grub_err_t
@@ -47,3 +48,21 @@ grub_tcg2_submit_command (grub_size_t input_size,
grub_uint8_t *input,
return GRUB_ERR_NONE;
}
+
+grub_err_t
+grub_tcg2_cap_pcr (grub_uint8_t pcr)
+{
+ TPMS_AUTH_COMMAND_t authCmd = {0};
+ TPM2B_EVENT_t data = {0};
+ TPM_RC_t rc;
+
+ /* A SEPARATOR event is an event with 4 0-bytes. */
+ data.size = 4;
+ authCmd.sessionHandle = TPM_RS_PW;
+
+ rc = grub_tpm2_pcr_event (pcr, &authCmd, &data, NULL, NULL);
+ if (rc != TPM_RC_SUCCESS)
+ return grub_error (GRUB_ERR_BAD_DEVICE, N_("cannot cap PCR %u"), pcr);
+
+ return GRUB_ERR_NONE;
+}
--
2.43.0
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